Pneumatic tourniquet apparatus and method of use

ABSTRACT

A pre-fabricated pneumatic tourniquet apparatus and related methods are provided. The tourniquet is easy to apply, ensures consistent and even circumferential pressure, is light weight, provides standard life saving operation, and can be utilized in any setting or situation. The pneumatic tourniquet apparatus is comprised of a bladder, a reservoir chassis, a retaining cover, a receiver and a slider. The bladder is elongated in shaped—long enough to wrap around most human limbs.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a divisional application of co-pending U.S. patentapplication Ser. No. 14/500,191, filed Sep. 29, 2014, which claimspriority pursuant to 35 U.S.C. 119(e) to U.S. Provisional PatentApplication Ser. No. 61/883,797, filed Sep. 27, 2013, the entiredisclosure of which is incorporated herein by reference.

GOVERNMENT RIGHTS

This invention was made with government support under W81XWH-12-P-0497awarded by USA MED RESEARCH ACQ ACTIVITY. The government has certainrights in the invention.

FIELD

Embodiments of the present invention are directed to a pneumatictourniquet and novel blood flow restriction device. In more detail,embodiments of the present invention are directed to an emergency use,pre-fabricated tourniquet used for restricting flow of blood duringextreme hemorrhage or exsanguination.

BACKGROUND

Exsanguination or major blood loss has been shown to be the majorleading cause of death on the battlefield and directly correlates tomajor trauma in the civilian sector. Throughout history, tourniquetshave been shown to save lives. Several large studies have confirmed thelifesaving benefit and low incidence of complications from pre-hospitaluse of tourniquets in combat casualties. Furthermore, the civilianEmergency Medical Services have adopted this opinion as well.Tourniquets are frequently used early in the care of trauma casualtiesbecause of the immediate lifesaving intervention capability and thespeed with which they can be applied. Moreover, tourniquets are thestandard of care for the temporary control of life-threatening extremityhemorrhage during the Care Under Fire (CUF) phase of the Tactical CombatCasualty Care (TCCC) in accordance with the Committee for TacticalCombat Casualty Care (CoTCCC) guidelines. These guidelines are becomingthe standard of care for treatment of massive hemorrhage across thespectrum of pre-hospital care worldwide.

Due to the nature of traumatic amputation and dismemberment, there is arequirement for application of an emergency tourniquet to be operated byone hand. For a device to be truly operable by only one hand, it must becapable of being placed on an extremity, upper or lower, without havingto perform fine motor skill functions. In general, tourniquet operationshould not require the use of fine motor skills, regardless of theone-handed operability requirement, because tourniquets are generallyonly used during periods of extreme duress (i.e., when it is difficultor impossible to expect the use of fine motor skills).

Traditionally, tourniquets were nothing more than a general section ofcloth material, usually a cravat, and a stick or dowel used as awindless. The general concept was to tighten the cloth material,reducing the circumference (diameter) of the cloth material against theextremity soft tissue, creating circumferential pressure sufficientenough to occlude blood flow. These make-shift tourniquets were oftenapplied with too much pressure and caused neurovascular damage in limbs.Although the patient's life and limb were saved, the affected limb waspermanently damaged. Therefore, a pre-fabricated tourniquet designed forconsistent, even circumferential pressure is ideal for emergency use.

Additionally, current tourniquet designs are prone to failure and aregenerally ineffective for use on lower extremities. Pneumatic tourniquetdesigns can be more desirable than a windless, mechanical design becausepneumatic tourniquets can be more effective at restricting blood flowand can be more comfortable during use. However, because of design andcost constraints, current pneumatic tourniquets are generally only usedin Hospital environments and are not effective or mechanically operablefor field use.

Furthermore, there are many situations in which a tourniquet can save alife other than in military applications. Some recreational activitiescan be inherently dangerous and can cause severe injury requiring theuse of such an emergency device, especially in a remote setting. Primaryexamples of this are camping, rock climbing, hiking, boating, etc.Footprint size and weight are always a consideration in such settingssince the individual user is required to carry the device in a backpack.Therefore, a ruggedized pre-fabricated tourniquet made of the strong andlight material would be best-suited for the end-user. Such a tourniquetwould provide for efficient transportation and effective, life-savingutilization.

Thus, there is a need for a pre-fabricated tourniquet that is easy toapply, that ensures consistent and even circumferential pressure, thatis light weight, that provides standard life saving operation, and thatcan be utilized in any setting or situation.

SUMMARY

One object of the general inventive concept is to provide apneumatically constricting tourniquet apparatus. The pneumatictourniquet apparatus is made up of a bladder, a reservoir chassis, aretaining cover, a receiver and a slider. The bladder is elongated inshaped—long enough to wrap around most human limbs. In some embodiments,the bladder is formed from a single sheet of plastic, folded over alongone edge and sealed along the other three edges so that the bladderholds and maintains air pressure while being inflated.

The reservoir chassis holds and protects the bladder. The reservoirchassis includes a main section that envelops the bladder and areservoir chassis extension section that extends from the main sectionbut does not envelop the bladder. A retaining cover attached to thereservoir chassis where the main section and the chassis extensionsection connect. The retaining cover covers and protects the reservoirchassis.

A receiver is connected to either the reservoir chassis or the retainingcover, at a location very near to where the retaining cover is attachedto the reservoir chassis. A slider is connected to the retaining coversuch that the slider can be slid to any point along the retaining cover.The receiver and slider are sized and shaped such that the slider istemporarily locked in position on the retaining cover as a frictionbuckle when engaged with the receiver.

Another object of the general inventive concept is to provide apneumatically constricting tourniquet apparatus. The pneumatictourniquet apparatus is made up of a bladder placed into a reservoirchassis, a retaining cover attached to the reservoir chassis, a receiverattached to the retaining cover or the reservoir chassis, and a sliderattached to the retaining cover. The reservoir chassis includes a mainsection that holds the bladder and an extension section connected to themain section. The retaining cover is attached to the reservoir chassisat a position adjacent to where the main section of the reservoirchassis connects to the extension section. The receiver is attached toeither the retaining cover or the reservoir chassis adjacent to theposition where the retaining cover is attached to the reservoir chassis.The slider is attached to the retaining cover such that the slider canslide to numerous positions along the retaining cover. The slider issized and shaped to engage with the receiver.

Another object of the general inventive concept is to provide a methodof making a pneumatically constricting tourniquet apparatus. The methodincludes sealing a bladder, inserting the bladder into a reservoirchassis, attaching a retaining cover to the reservoir chassis,connecting a receiver to either the reservoir chassis or the retainingcover, and connecting a slider to the retaining cover. In someembodiments, the bladder is formed from a single sheet of plastic,folded over along one edge and sealed along the other three edges sothat the bladder holds and maintains air pressure while being inflated.The bladder is inserted into the reservoir chassis to hold and toprotect the bladder. The reservoir chassis includes a main section thatenvelops the bladder and a reservoir chassis extension section thatextends from the main section but does not envelop the bladder. Theretaining cover is attached to the reservoir chassis where the mainsection and the chassis extension section connect. The retaining covercovers and protects the reservoir chassis.

A receiver is connected to either the reservoir chassis or the retainingcover at a location near where the retaining cover is attached to thereservoir chassis. The slider is connected to the retaining cover suchthat the slider can be slid to any point along the retaining cover. Thereceiver and slider are sized and shaped such that the slider istemporarily locked in position on the retaining cover as a frictionbuckle when engaged with the receiver.

Another object of the general inventive concept is to provide a methodof making a pneumatically constricting tourniquet apparatus. The methodincludes placing a bladder into a reservoir chassis, attaching aretaining cover to the reservoir chassis, attaching a receiver to theretaining cover or the reservoir chassis, and attaching a slider to theretaining cover. The reservoir chassis includes a main section thatholds the bladder and an extension section connected to the mainsection. The retaining cover is attached to the reservoir chassis at aposition adjacent to where the main section of the reservoir chassisconnects to the extension section. The receiver is attached to eitherthe retaining cover or the reservoir chassis adjacent to the positionwhere the retaining cover is attached to the reservoir chassis. Theslider is attached to the retaining cover such that it can be slid alongthe retaining cover. The slider is sized and shaped to engage with thereceiver.

The foregoing and other objects are intended to be illustrative of theinvention and are not meant in a limiting sense. Many possibleembodiments of the invention may be made and will be readily evidentupon a study of the following specification and accompanying drawingscomprising a part thereof. For example, dimensional values includedherein are provided for exemplary purposes, and embodiments of thepresent invention contemplate tourniquets or tourniquet componentshaving a various dimensional values. Furthermore, various features andsubcombinations of invention may be employed without reference to otherfeatures and subcombinations. Other objects and advantages of thisinvention will become apparent from the following description taken inconnection with the accompanying drawings, wherein is set forth by wayof illustration and example, an embodiment of this invention.

DRAWINGS

Embodiments of the invention are set forth herein and are shown in thefollowing drawings:

FIG. 1 shows an exemplary pneumatic tourniquet according to embodimentsof the present invention.

FIG. 2 shows an exemplary bladder that can be positioned within areservoir chassis of the tourniquet from FIG. 1.

FIG. 3 shows an exemplary receiver of the tourniquet from FIG. 1.

FIG. 4 shows an exemplary slider of the tourniquet from FIG. 1.

FIG. 5A shows an additional view of a pneumatic tourniquet according toembodiments of the present invention.

FIG. 5B is a detail view on an enlarged scale of a portion of thetourniquet from FIG. 5A.

FIG. 6 shows an additional view of a pneumatic tourniquet according toembodiments of the present invention.

FIG. 7 shows an additional view of a pneumatic tourniquet according toembodiments of the present invention.

FIG. 8 shows another exemplary bladder that can be positioned within areservoir chassis of the tourniquet from FIG. 1.

DETAILED DESCRIPTION

The following detailed description of the invention references theaccompanying drawings that illustrate specific embodiments in which theinvention can be practiced. The embodiments are intended to describeaspects of the invention in sufficient detail to enable those skilled inthe art to practice the invention. Other embodiments can be utilized andchanges can be made without departing from the scope of the presentinvention. The following detailed description is, therefore, not to betaken in a limiting sense.

In this description, references to “one embodiment,” “an embodiment,” or“embodiments” mean that the feature or features being referred to areincluded in at least one embodiment of the technology. Separatereferences to “one embodiment,” “an embodiment,” or “embodiments” inthis description do not necessarily refer to the same embodiment and arealso not mutually exclusive unless so stated and/or except as will bereadily apparent to those skilled in the art from the description. Forexample, a feature, structure, act, etc. described in one embodiment mayalso be included in other embodiments, but is not necessarily included.Thus, the present technology can include a variety of combinationsand/or integrations of the embodiments described herein.

With reference to the figures, and in particular FIG. 1, embodiments ofthe present invention are directed to a pneumatic tourniquet forrestricting a blood flow in a body part, such as an upper or a lowerextremity, with the tourniquet comprising: (a) a bladder 200 (See FIGS.2 and 8) sealed from 3 edges to hold and maintain air pressure whilebeing inflated with an inflation pump 108; (b) a reservoir chassis 102to hold and to protect the bladder 200, with the reservoir chassis 102including a main section that holds the bladder 200 and a reservoirchassis extension section 101 that extends from the main section butdoes not hold the bladder 200; (c) a retaining cover 103 that isattached to the reservoir chassis 102 where the main section and thechassis extension section connect, with the retaining cover 103 operableto cover and protect the reservoir chassis 102 (d) a receiver 106 (Seealso FIG. 3) connected to either the reservoir chassis 102 or theretaining cover 103 proximate to where the retaining cover 103 isattached to the reservoir chassis 102, with the receiver 106 beingoperable to accept a slider 107 (See also FIG. 4) that is positioned onthe retaining cover 103 from any position along the retaining cover 103,and furthermore with the receiver 106 being operable to allow a user to“snap” the slider 107 into place and lift the lip 303 of the receiver106 to remove the slider 107 upon demand; (e) the slider 107 serves as afriction buckle operable to be placed along any section of the retainingcover 103, with the slider 107 including one round side bar 401 and onesquare side bar 402 with grippers 405 allowing for free rotation whenattached to the receiver 106. In operation, the pneumatic tourniquet(See also FIGS. 5A-7) is operable, via the above described components(a-e), to form a continuous loop around an extremity, such as an arm ora leg, so as to create a circumferential pressure that will restrictblood flow. Such a circumferential pressure is created by and 1) joiningthe slider 107 and the receiver 106 together and manipulating theretaining cover 103 so as to reduce the circumference of the tourniquet,and 2) pumping air into the bladder 200.

With respect to FIG. 1 (see also FIGS. 5A-7), the reservoir chassis 102retains and protects the air bladder 200. In some embodiments, the totallength is 33 inches and the width is between 2 and 4 inches. In someembodiments, the reservoir chassis 102 includes a section of dual hookand loop fasteners on both sides of the reservoir chassis faces. Inother words, the dual hook and loop fasteners are on the side facing“in” and the side facing “out.” The tourniquet also includes a retainingcover 103 sized and shaped to overlap the reservoir chassis 102 as asecondary securing mechanism to prevent slippage or pressure reduction.The retaining cover 103 also provides extra protection for the reservoirchassis 102 and bladder 200. The outer surface of the retaining cover103 includes dual hook and loop fasteners. The reservoir chassisextension 101 does not contain the bladder 200. The reservoir chassisextension 101 is sized and shaped to accommodate larger arm or legcircumferences. In some embodiments, the reservoir chassis 102 and/orthe retaining cover 103 further include a blank label 109. The blanklabel 109 may be used to write the time when the tourniquet is appliedor various other relevant notes regarding patient care.

Extending from the bladder 200 (see also FIGS. 2 and 8) is a nipple 104that connects the bladder to an air pump. In some embodiments, a halfbulb inflation pump 108 is used to pump air into the bladder 200 via thenipple 104. In some embodiments, the half bulb inflation pump 108 islatex free and ergonomically designed for ease of use. In someembodiments, the inflation mechanism includes a relief valve 105 tomanually control the release of pressure inside the bladder 200. In someembodiments, the inflation includes a metal clamp 201, such as a smallbrass ring, attached to the connection between the nipple 104 and therelief valve 105 or inflation pump 108.

In more detail, the retaining cover 103 (See FIGS. 1 and 5A-7) includesdual hook and loop (i.e., Velcro) on its exterior surface and a nylondenier on its interior surface (i.e., the surface that faces the bladder200). Thus, the retaining cover 103 is operable to cover and protect thereservoir chassis 102 and also operable to secure the tourniquet aroundan extremity. For example, the retaining cover 103 can be positioned ina continuous loop around an extremity by wrapping the retaining cover103 around the extremity. Next, the slider 107, which is adjustablysecured to the retaining cover 103, can be secured to the receiver 106,which is fixably connected to either the reservoir chassis 102 or theretaining cover 103, as previously described. In such an arrangement,the diameter of the continuous loop can be shortened by pulling theretaining strap further through slider 107, thus creating an increasedcircumferential pressure (i.e., a radial compression). Once a preferreddiameter has been obtained, such a diameter can be maintained by foldingthe retaining cover 103 back upon itself and securing such a positionvia the hook and loop of the retaining cover 103.

In some embodiments, the bladder 200 (See FIGS. 2 and 8) of thepneumatic tourniquet is formed from a polyurethane plastic material bysealing 3 edges of the plastic material. Furthermore a nipple 104 isattached to the polyurethane plastic and extends therefrom at anapproximately 90 degree angle. From the nipple 104, a silicon tube 202extends a distance and connects with the pump 108, which may, in someembodiments include a semicircle pressure inflation bulb (e.g., anergonomically designed hemicycle pressure pump). Embodiments in whichthe pump 108 is a semicircular face may be preferable in instances whenthe tourniquet is required to be packaged in a small space. In certainembodiments, the bladder 200 is preferred to hold at least 450 mmHg ofpressure, so as to be sufficient to stop blood flow and hemorrhage in anextremity. In other embodiments, the bladder 200 will hold more or lessthan 450 mmHg. In some embodiments, the bladder 200 will beapproximately 25 inches in length, so as to be sufficient for use withhuman extremities (i.e., arms and legs) that have sizes within the 5thto 95th percentile. Regardless, embodiments of the present inventioncontemplate bladder lengths that are more or less than 25 inches.Furthermore, in some embodiments, the width of the bladder will beapproximately 1.5 inches, which proves for a broad pressure base thatcan be applied to an extremity. However, it is understood that widthsmore or less than 1.5 inches may be used in some embodiments. Thebladder 200 will, in some embodiments, also include a relief valve 105that provides for a manual or automatic release of air pressure withinthe bladder 200.

Embodiments of the present invention provide for the reservoir chassis102 (See FIGS. 1 and 5A-7) to protect the bladder 200 (See also FIGS. 2and 8) from environmental damages that may occur during transportationor use of the tourniquet. In some embodiments, the reservoir chassis 102will be formed in a coyote brown color to uniquely identify a firstapplication of the tourniquet over the circumference of the damagedextremity. In some embodiments, a length of the reservoir chassis 102 isapproximately 33 inches. However, in other embodiments, the chassis 102may be more or less than 33 inches. With the total length of thereservoir chassis 102 being 33 inches, some embodiments provide for themain section to be about 25 inches length (or at least long enough tohold the bladder 200), and the extension section 101 to be about 8inches in length. In some embodiments, the extension section 101 isincluded so as to provide for the comfortable placement of thetourniquet onto larger sized extremities. Further, some embodimentsprovide for two sections of approximately 16 inches of hook and loop tobe positioned on an interior and exterior surface of the reservoirchassis. In particular, a first section of hook and loop is positionedon the exterior surface of the reservoir chassis 102 adjacent to an endof the reservoir chassis 102 that is opposite the extension section 101.In some embodiments, more or less than 16 inches of hook and loop willbe added to the reservoir chassis 102. In certain additionalembodiments, the interior surface of the reservoir chassis 102 will havea section of hook and loop thereon, with the section covering theextension section 101 and extending from the extension section 101 alonga portion of the main section. In such embodiments, the main section ofthe reservoir chassis 102 can be wrapped around an extremity and can besecured in place by connecting the dual hook and loop on the outersurface of the main section with the dual hook and loop on the interiorsurface of the extension section 101. As such, the tourniquet can beinitially positioned over and secured to an extremity until the slider107 can be connected to the receiver 106 and the retaining cover 103tightened and secured in a preferred position. Once the retaining cover103 is tightened and secured in a preferred position, the bladder 200can be pumped up and filled with air to create the intendedcircumferential pressure to stop hemorrhaging and blood loss.

In some embodiments, the pneumatic tourniquet includes the retainingcover 103 (See FIGS. 1 and 5A-7) which is sewn with nylon coated fabricand dual hook and loop, as previously described. In some embodiments,the retaining cover 103 is approximately 39 inches length. In otherembodiments, the retaining cover 103 may be more or less than 39 inches.The retaining cover 103 preferably overlaps the reservoir chassis 102 asa secondary securing mechanism to prevent any slippage and providesextra protection. The retaining cover 103 includes a time label 109which is comprised of a clothing label and is inserted on an end of thecover to write the time when application of the tourniquet is made.

Additional embodiments of the present invention include a tourniquet(See FIGS. 1 and 5A-7) that is operable for restricting a flow of bloodin a body part, such an upper or a lower extremity, with such atourniquet comprising: (a) a bladder 200 (See FIGS. 2 and 8) placed intoa reservoir chassis 102, with the reservoir chassis 102 including a mainsection that holds the bladder 200 and an extension section 101connected to said main section; (b) a retaining cover 103 attached tothe reservoir chassis 102 at a position adjacent to where the mainsection of the reservoir chassis 102 connects to the extension section101; (c) a receiver 106 (See also FIG. 3) joined with the retainingcover 103 or the reservoir chassis 102 adjacent to the position wherethe retaining cover 103 is attached to the reservoir chassis 102; and(c) a slider 107 (See also FIG. 4) attached to the retaining cover 103for quick application to the receiver 106. In such embodiments, when thetourniquet is placed onto the damaged circumference of the extremity,the slider 107 can be attached to the receiver 106 and then theretaining cover 103 can be adjusted to a preferred position so as tocreate a circumferential pressure. Furthermore, the retaining cover 103can be secured in such a position by folding an end of the retainingcover 103 back on itself such that the dual hook and loop of theretaining cover 103 secures the retaining cover 103 in place.

As illustrated in FIG. 3, the receiver 106 includes a hook-shaped catch301 that the round side bar 401 of the slider 107 (See FIG. 4) can beplaced into or removed from by the user on demand through application ofthe receiver flange 302. A lip portion 303 of the receiver is thenarrower portion of the receiver 106 and facilitates ease of placementfor the round side bar 401 of the slider 107, and the bar locks the hookslider into place.

With respect to FIG. 3, in some embodiments, the hook-shaped catch 301(or slider niche) is sized and shaped to mate with and receive theslider 107 and lock the slider 107 securely in place. The receiverflange 302 guides and provides an easy placement for the slider 107which locks the retaining cover 103 in place. The flange 302 slopesupward to facility placement. The lip 303 is a narrower part of thereceiver 106 to provide an easy placement with the receiver flange 302for the slider 107. A bar 304 hangs down from the lip 303. The bar 304supports locking of the hook slide and prevents unintentionaldisplacement (dislodging) of the slider 107 from the receiver 106. Thebar 304 allows the slider 107 to “snap” or audibly “click” when theslider 107 and receiver 106 are properly mated. A supporter 306 is athicker portion of the receiver 106 that structurally supports thereceiver slot 305. The receiver slot 305 is a space for a receiverholder to connect the receiver 106 to the retaining cover 103 orreservoir chassis 102.

With reference to FIG. 4, the slider 107 functions as a friction bucklethat is operable to be placed anywhere on the retaining cover 103. Thesquare side bar 402 of the slider 107 with protruding grippers 405facilitates friction when the round side bar 501 is placed into thereceiver 106 (See FIG. 3). As such, the slider 107 reduces slippage, yetallows excess slack to be removed from the diameter of thecircumferential tourniquet body upon demand from the user with an upwardpulling motion of the retaining cover 103. Furthermore, the retainingcover 103 can be pre-routed through the slider 107, thus avoiding thenecessity to route the retaining cover 103 through the slider 107 duringuse.

Avoiding the need to route the retaining cover 103 through the slider107 is one of the major advantages of the present inventive concept.Under duress or in emergency situations, many users experiencecompromised fine motor skills. One example of a prior art tourniquetrequires the user to route a strap through two specific slots in abuckle in a specific order. Studies showed that in a large number offailures of the prior art tourniquet resulting in death, the user hadrouted the strap through the buckle incorrectly. The present inventiveconcept addresses this known problem by adding a feature that makes itdifficult or impossible to pull the terminal end through the buckle. Insome embodiments, the terminal end of the retaining cover 103 is foldedover on to itself. This creates a “stop” that discourages the user frompulling the retaining cover 103 out of the slider 107. In someembodiments, the folded-over terminal end is sewn such that it cannot beunfolded. In some embodiments, the folded-over terminal end includes aninsert, preferably plastic, to increase the size of the “stop” andfurther decreasing the ability of the user to pull the terminal endthrough the slider 107.

With respect to FIG. 4, in some embodiments, the slider 107 includes around edge 401 (or round side bar). The round side bar 401 is sized andshaped to interface with the receiver 106. The round side bar 401 issized and shaped to allow for articulation when mated with the receiver106. The slider 107 further includes a frame 402 (or square side bar).The square side bar 402 gives support, structure and shape to the slider107. In some embodiments, the slider 107 will be a distinctive color toeasily and quickly visually distinguish the slider's position relativeto the retaining cover 103. For example, in some embodiments, the slider107 is coyote brown. In some embodiments, the slider 107 includes aslider friction bar 403. The slider friction bar 403 provides frictionand inhibits the release of tension when the tourniquet is applied. Thefriction bar 403 is positioned higher than the side bars 401 and 402.The friction bar 403 is sized and shaped to lock the slider 107 inposition when the tourniquet is applied. The slider 107 further includesslider gaps 404. The retaining cover 103 is routed through the slidergaps 404 with dual hook and loop fasteners on the retaining cover 103side that faces toward the slider friction bar 403. The square side bar402 of the slider 107 also includes grippers 405. The grippers 405facilitate friction when the round slider bar 401 is placed into thereceiver 106. This stops slippage, yet allows excess slack to be removedfrom the retaining cover 103 continuous loop upon demand with an upwardpulling motion of the retaining cover 103.

Together, the slider 107 (See FIG. 4) and the receiver 106 (See FIG. 3)function as a buckle, so as to create a continuous loop of thetourniquet. Adjustments can be made, via the slider 107, for shorteningor lengthening the continuous loop once applied, and/or the slider 107can be attached or detached from the receiver 106 to facilitate ease ofapplication by the user.

In some embodiments, certain portions of the tourniquet, such as thereservoir chassis 102 and the retaining cover 103 may be made fromvarious types of elastic and/or inelastic flexible material, such aswoven fabric, vinyl, leather, neoprene, nylon, etc. Additionally, othercomponents of the tourniquet (e.g., receiver 106 and slider 107) may bemade from rigid or semi-rigid materials, such as various types plastics,metals, or the like. Furthermore, portions of the bladder 200, includingthe bladder 200 itself or the nipple 104, tubing 202, and pump 108, maybe made from various materials that are flexible but operable tosecurely hold fluid therein, such as neoprene, polyurethane, otherplastic, or other similar material.

While the present general inventive concept has been shown in thedrawings and fully described above with particularity and detail inconnection with what is presently deemed to be the most practical andpreferred embodiment(s) of the invention, it will be apparent to thoseof ordinary skill in the art that many modifications thereof may be madewithout departing from the principles and concepts set forth herein,including, but not limited to, variations in size, materials, shape,form, function and manner of operation, assembly and use.

It is also to be understood that the following claims are intended tocover all of the generic and specific features of the invention hereindescribed, and all statements of the scope of the invention which, as amatter of language, might be said to fall therebetween. Hence, theproper scope of the present general inventive concept should bedetermined only by the broadest interpretation of the appended claims soas to encompass all such modifications as well as all relationshipsequivalent to those illustrated in the drawings and described in thespecification.

Finally, it will be appreciated that the purpose of the annexed Abstractis to enable the U.S. Patent and Trademark Office and the publicgenerally, and especially the scientists, engineers and practitioners inthe art who are not familiar with patent or legal terms or phraseology,to determine quickly from a cursory inspection the nature and essence ofthe technical disclosure of the application. Accordingly, the Abstractis neither intended to define the invention or the application, whichonly is measured by the claims, nor is it intended to be limiting as tothe scope of the invention in any way.

What is claimed is:
 1. A method of making a tourniquet apparatus forrestricting blood flow in a limb, the method comprising: sealing anelongated bladder such that the elongated bladder is moveable between aninflated configuration and a deflated configuration, the inflated anddeflated configurations of the elongated bladder being associated withrespective constricted and unconstricted configurations of thetourniquet; inserting the elongated bladder into an elongated reservoirchassis such that a main section of the elongated reservoir chassisenvelops the bladder, wherein the tourniquet apparatus is moveable to anengaged configuration by wrapping the elongated reservoir chassis aroundthe limb, thereby creating a first loop; attaching a proximal end of aretaining cover to a proximal end of the main section of the elongatedreservoir chassis, wherein the retaining cover is operable to cover andprotect the elongated reservoir chassis when the tourniquet apparatus isin the engaged configuration, thereby forming a second loop; connectinga receiver to at least one of the elongated reservoir chassis or theretaining cover proximate to the proximal end of the retaining cover;and connecting a slider to the retaining cover such that the slider canbe positioned at any point along the retaining cover, thereby dividingthe retaining cover into a first portion extending between the sliderand the proximal end of the retaining cover and a second portionextending between the slider and a distal end of the retaining cover,the receiver and slider being sized and shaped such that the slider istemporarily locked in position on the retaining cover as a frictionbuckle when the slider is locked into the receiver.
 2. The method ofclaim 1, wherein the slider includes a round side bar and a square sidebar with a plurality of grippers.
 3. The method of claim 1, wherein thesecond loop is formed by mating the slider and the receiver together. 4.The method of claim 1, wherein the receiver includes a hook-shaped catchinto which the slider can be placed or removed, and wherein a lipportion of the receiver is narrower than the receiver and facilitatesease of placement of the slider and locks the hook-shaped catch andslider into place.
 5. The method of claim 1, wherein an inner surface ofthe reservoir chassis is configured to selectively secure to an outersurface of the reservoir chassis, thereby creating the first loop. 6.The method of claim 5, wherein each of the inner and outer surfaces ofthe reservoir chassis include a plurality of corresponding hook and loopfasteners.
 7. The method of claim 5, wherein the retaining cover isconfigured to create a continuous loop for encircling the limb, theretaining cover being configured to prevent slippage of the connectionbetween the inner and outer surfaces of the reservoir chassis, therebypreventing pressure reduction.
 8. The method of claim 1, wherein atleast one of the reservoir chassis or the retaining cover includes dualhook and loop fasteners such that said at least one of the reservoirchassis or the retaining cover can be attached to itself.
 9. A method ofmaking a tourniquet apparatus, the method comprising: placing a bladderinto a reservoir chassis, the reservoir chassis including a main sectionthat holds the bladder and an extension section connected to andextending from a proximal end of said main section, said extensionsection being configured to selectively couple to an outer surface ofsaid main section so as to secure the tourniquet apparatus in an engagedconfiguration, wherein said reservoir chassis forms a first loop whenthe tourniquet apparatus is in the engaged configuration; attaching aretaining cover to the reservoir chassis at a position adjacent to wherethe main section of the reservoir chassis connects to the extensionsection, said retaining cover being configured to wrap around saidreservoir chassis when the tourniquet apparatus is in the engagedconfiguration, thereby forming a second loop; attaching a receiver tothe retaining cover or the reservoir chassis adjacent to the positionwhere the retaining cover is attached to the reservoir chassis; andattaching a slider to the retaining cover, the slider being sized andshaped to engage with the receiver, the slider being sized and shapedsuch that the slider can be positioned at any one of a plurality ofpositions along the retaining cover, wherein wrapping said retainingcover around said reservoir chassis and locking said slider into saidreceiver when the tourniquet apparatus is in the engaged configurationcauses the tourniquet apparatus to move to a secured configuration withthe slider temporarily locked in position on the retaining cover. 10.The method of claim 9, wherein the slider includes a round side bar anda square side bar with a plurality of grippers.
 11. The method of claim9, wherein the receiver includes a hook-shaped catch into which theslider can be placed or removed, and wherein a lip portion of thereceiver is narrower than the receiver and facilitates ease of placementof the slider and locks the hook-shaped catch and slider into place. 12.The method of claim 9, wherein an inner surface of the reservoir chassisis configured to selectively secure to an outer surface of the reservoirchassis, thereby creating the first loop.
 13. The method of claim 12,wherein each of the inner and outer surfaces of the reservoir chassisinclude a plurality of corresponding hook and loop fasteners.
 14. Themethod of claim 12, wherein the retaining cover is configured to createa continuous loop, the retaining cover being configured to preventslippage of the connection between the inner and outer surfaces of thereservoir chassis, thereby preventing pressure reduction.
 15. The methodof claim 9, wherein at least one of the reservoir chassis or theretaining cover includes dual hook and loop fasteners such that said atleast one of the reservoir chassis or the retaining cover can beattached to itself.